Venice and Veneto

We highly recommend attending a Vivaldi Concert in Venice. San Vidal Church-Chiesa San Vidal.
We purchased our tickets at the church the day before the performance. That said, I don't know how booked they are in Dec. We attended a Thursday eve. performance because we especially wanted to hear our favorite "Four Seasons." This was the highlight of our stay! www.interpretiveneziani.com

Remember that you’ve got 2 holidays (and their eves) on which all or much will be closed. I would advise you to rethink how much you could reasonably enjoy in the short time you’ll have in Italy. Train service between the cities you’re visiting is very good as well as economical. With costs of fuel and parking being quite expensive and the possibility of wandering into a ZTL, I’d advise against having a car for you4 proposed itinerary.

Before settling on your route, research if any of the sites you want to see will be closed or entry restricted because of the holidays. You should also look up train schedules for Sundays and holidays when service might be curtailed. I love the Veneto and visited the last two years. Ravenna is sort of out of the way and I would save it for another time. Think about going to Verona and then staying in either Vicenza or Padova before heading to Venice. Ravenna is a 4-5 hour train ride from either Verona or Venice. Easy to go by train to Bassano or Treviso.

In Verona, check out the Christmas Market (Mercatini di Natale) in Piazza dei Signore. Closes at 5 pm Christmas Eve and reopens 4 pm Christmas Day.
http://www.nataleinpiazza.it/2018/

Venice has a lot of evening concerts, Vivaldi is performed almost continuously (his hometown) but they through in some Bach and other Baroque composers too. Chiesa della Pieta and Chiesa di San Vidal are two venues that do these. News years eve concert at San Vidal.
https://www.classictic.com/en/interpreti_veneziani__new_year_s_concerts/31896/628363/

I think a car would be a PITA in these towns. Train service is cheap and frequent.

Ravenna's just a bit over 3 hours from Venice by train (change in Bologna); it's about 2-1/2 hours from Padua, which would still make for quite a long day. I loved Ravenna, but it's more easily visited from Bologna, which I believe is also a good base for seeing Parma and Modena. Maybe on the next trip?

No need for a car on this route, especially if Ravenna is not mandatory. Trains will take you right to each city center, but note that trains from Verona to Ferrara require a connection in either Padua or Bologna. Ravenna is the least convenient train connection, so maybe you'd skip it, but if you're willing to depart from Ferrara to Ravenna at 6:25 a.m., there's a direct train at that time and a direct return train departing Ravenna at about 16:15. Re-check schedules in two weeks.

Regarding evening music events in Venice there is a helpful website https://www.musicinvenice.com which has a variety of reasonably priced concerts that are offered. It was a dream come true for us to go to a Four Seasons concert by Vivaldi at Chiesa Della Pieta which was the church where Vivaldi actually worked. We got our tickets at the church the day of the concert for 20 Euros each. Many other churches in Venice offer evening concerts also. Chiesa San Maurizio offered evening concerts as well. You can enjoy the orchestras playing in St Mark's Square, too, and relax with coffee or hot chocolate at one of the cafes on the square.

Can the tickets to the Four Seasons concert by Vivaldi at Chiesa Della Pieta be pre-purchased online or does one need to show up the day of? Thank you.

It looks like you can purchase tickets for the Four Seasons Vivaldi concert at https://www.musicinvenice.com/chiesa-della-pieta
Under filter you can type in the specific date and choose the concert by I Virtuosi Italiani and order your tickets. Another website www.chiesavivaldi.it has a picture of the inside of Vivaldi's church and you can look at the date by clicking on concerts and it shows the choices by month.

Thank you!